For stover all-metal lock nuts (inch) in A4 Stainless Steel, the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) is summarized below together with every size supplied.
Why Choose A4 Stainless Steel for Stover All-Metal Lock Nuts (Inch)
Specified for marine, coastal and chemical applications. For stover all-metal lock nuts (inch), this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Stover All-Metal Lock Nuts (Inch) in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Galvanic & Galling Considerations
Two important notes for stainless stover all-metal lock nuts (inch): (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.
Using Stainless Fasteners in Aluminum
Stainless steel is more noble than aluminum, so with an electrolyte present — rain, condensation, salt spray — the aluminum becomes the anode and corrodes at the joint. Area ratio decides how bad it gets: a small stainless fastener in a large aluminum section is normally acceptable, a large stainless fastener in thin aluminum is not. Where the joint gets wet, isolate the metals with a coated or nylon washer and a sealant, or specify an aluminum or coated fastener instead.
Sizes of Stover All-Metal Lock Nuts (Inch) Available in A4 Stainless Steel
| Size | Threads per inch | Width across flats (in) | Nut height (in) | Grade | Max service temperature (°C) | Re-use | Fitting orientation |
|---|---|---|---|---|---|---|---|
| 1/4" | 20 | 7/16 | 15/64 | Grade C | 400 | 5 cycles typical | Flat face to joint |
| 5/16" | 18 | 1/2 | 17/64 | Grade C | 400 | 5 cycles typical | Flat face to joint |
| 3/8" | 16 | 9/16 | 21/64 | Grade C | 400 | 5 cycles typical | Flat face to joint |
| 1/2" | 13 | 3/4 | 7/16 | Grade C | 400 | 5 cycles typical | Flat face to joint |
| 5/8" | 11 | 15/16 | 35/64 | Grade C | 400 | 5 cycles typical | Flat face to joint |
| 3/4" | 10 | 1-1/8 | 41/64 | Grade C | 400 | 5 cycles typical | Flat face to joint |
Dimensions are independent of the material: every size above is available in A4 Stainless Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
A4 Stainless Steel is one of the grades the catalog describes. Thread, height, across-flats, property class, locking feature and flange form can all be varied, including thread sizes the standard series does not run to. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
